University Physics with Modern Physics (14th Edition)
University Physics with Modern Physics (14th Edition)
14th Edition
ISBN: 9780321973610
Author: Hugh D. Young, Roger A. Freedman
Publisher: PEARSON
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Chapter 38, Problem 38.11E

(a)

To determine

The photoelectric threshold wavelength for copper surface.

(b)

To determine

The work function for the surface and compare the value with the one given in Table 38.1 .

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When ultraviolet light with a wavelength of 254 nm falls on a clean copper surface, the stopping potential necessary to stop emission of photoelectrons is 0.181 V. (a) What is the photoelectric threshold wavelength for this copper surface? (b) What is the work function for this surface, and how does your calculated value compare with that given in Table
1.2. When a photoelectric cell with a copper cathode is illuminated by a Hg arc lamp, with wavelength 245 nm, the reverse potential across the cell (i.e. the voltage that just stops the fastest emitted electrons) is measured to be 0.181 V. Calculate the work function and threshold frequency of copper.
The following data gives stopping potential Vo versus wavelength for photoelectrons produced from a metal surface. (Be sure to include the correct units and use three significant figures.) Table 1 Vo (nm) (volts) 50 22.3 100 9.29 150 5,20 200 3.09 250 1.84 300 1.04 Use an analysis similar to that used in the inlab procedure to determine the work function (in ev) for this surface. (Use 1 ev = 1,602 x 10-19 J, e- 1.602 x 10-19 C, c = 2.998 x 10 m/s, and h= 6.626 x 10-34 )-s = 4.136 x 10"15 ev -s as necessary.) X ev

Chapter 38 Solutions

University Physics with Modern Physics (14th Edition)

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